Brewer's Yeast When Breastfeeding: Does It Improve Milk Supply?

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Breast milk is the main source of nourishment for babies, and it supplies all the essential nutrients to a baby for healthy growth and development. Hence, besides eating a well-balanced diet, several mothers may consider using brewer’s yeast when breastfeeding.

However, while anecdotal evidence suggests that brewer’s yeast can help improve breast milk production, is its use during lactation safe for the mother and baby? Continue reading as we tell you more about brewer’s yeast, its safety for babies and breastfeeding mothers, and its possible health benefits and side effects.

What Is Brewer’s Yeast?

Brewer's yeast is used to make bread

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Brewer’s yeast is a fungus made from the one-celled Saccharomyces cerevisiae. It is predominantly used in the brewing of alcoholic beverages, and hence its name. Brewer’s yeast is also used in making bread, although it is different from baker’s yeast. Brewer’s yeast is quite popularly used as a nutritional supplement since 52% of it is protein, and is also an excellent source of B-complex vitamins (1).

Is It Safe To Take Brewer’s Yeast While Breastfeeding?

Use brewer's yeast when breastfeeding under the lactation counselor's guidance

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It is not known if brewer’s yeast is safe when you are breastfeeding since there is insufficient scientific research on it. Medical experts suggest the mothers consult a doctor before having it.

Before deciding to take any galactagogue, you should consider the reasons for doing so. Why do you feel that your breastmilk supply is not adequate? Analyze this and then speak with an IBCLC.

Does Brewer’s Yeast Help Improve Breast Milk Supply?

Probably. Brewer’s yeast has been traditionally used as a breast milk stimulant. Despite its long-standing use as a galactagogue, there is little scientific evidence to suggest that it works. A study found brewer’s yeast efficacy ambiguous, as it was with other galactagogues (2).

While the fungus’ milk-stimulant properties have been anecdotal, lactating mothers can use brewer’s yeast as milk stimulant after doctor consultation. Do keep in mind that the effects of this yeast may vary from person to person.

What Is The Ideal Dosage Of Brewer’s Yeast During Lactation?

Health experts state that one to two tablespoons (15–30 grams) of brewer’s yeast powder a day are ideal (3). However, suggested doses may vary, and so, lactating women should consult their healthcare providers before consuming any supplements

If you do not see any improvement in your breast milk even after several weeks of consumption, then it is best to stop and consult a doctor.

How To Take Brewer’s Yeast When Breastfeeding?

Brewer’s yeast is available in the form of tablets and powder. You can add the recommended quantities of the powder by adding it to preparations like cookies or have it dissolved in water. There is no fixed dosage for brewer’s yeast tablets since the content of the yeast in a tablet varies, depending on the manufacturer. So the dosage can go as high as eight tablets a day.

It is best to stick to the powdered version to ensure you get the correct dosage.

What Are The Health Benefits Of Brewer’s Yeast?

Brewer’s yeast is an excellent source of vitamins and micronutrients, which eventually prevent deficiency diseases. It is also a good source of protein for those who need it in large quantities. Brewer’s yeast is known to improve some conditions like acne (1).

Individuals with diabetes may show better glucose tolerance when provided with a controlled amount of brewer’s yeast daily.

Below are the vital nutrients found in brewer’s yeast (4):

  • Protein in the form of 16 types of amino acids
  • Chromium
  • Selenium
  • Phosphorus
  • All B-complex vitamins

Brewer’s yeast is often considered a nutritional supplement for vitamin B-complex and the micronutrient selenium.

Are There Any Side Effects Of Brewer’s Yeast?

An allergic reaction to the brewer's yeast may lead to a headache

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An allergic reaction to the brewer's yeast may lead to a headache

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Yes. Some individuals could display an allergic reaction to brewer’s yeast. Symptoms of an allergic reaction include nausea, vomiting, skin hives with intense itching, and abdominal pain. You may also experience side effects such as a headache, bloating of the stomach, and gassiness. Severe allergic reactions can cause anaphylactic shock, where the immune system floods the body with chemicals, causing a shock, an increase in blood pressure, and narrowing air passages (breathing becomes difficult).

Since brewer’s yeast has the potential to cause side effects, you should avoid it in some situations.

When To Avoid Brewer’s Yeast?

You must avoid having brewer’s yeast in the case of:

  1. History of food allergies: If you develop an allergy to any new food, then you must avoid having brewer’s yeast. Those with allergies towards mushrooms, a type of fungus, should preferably avoid brewer’s yeast since yeast is a fungus too.
Women with mushroom allergies may be allergic to the brewer's yeast

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  1. Diabetes: Brewer’s yeast can lead to a sudden drop in blood sugar among diabetics who are on medication. Therefore, do not consume brewer’s yeast without a doctor’s consultation if you have diabetes. However, when consumed in correct dosages as prescribed by the doctor, the yeast can be beneficial for pregnant women with diabetes.
  1. Having medicines for depression: Do not mix antidepressants with brewer’s yeast, which contains a compound called tyramine. Tyramine can react with monoamine oxidase inhibitors (MAOIs) and increase blood pressure, thus putting the person at the risk of a heart attack or stroke.
  1. Inflammatory bowel disease (IBD): Those with inflammatory bowel disease (IBD), especially Crohn’s disease, should not have yeast as it causes excessive flatulence and may lead to severe abdominal pain and discomfort.
  1. Do not mix with other galactagogues: If you are taking other galactagogues, then stop their consumption before having brewer’s yeast. Having multiple galactagogues together may cause a reaction and complicate things.
  1. Avoid in some cases: If you are prone to excessive flatulence, then you must consult a doctor before having brewer’s yeast. Those with a history of migraine should avoid yeast since a headache is one of its side effects. People with gout should also avoid this yeast since it can cause protein overload. Individuals on antifungal medication and a high protein diet should consult a physician before having brewer’s yeast.
Brewer's yeast may worsen migraine in nursing mothers

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Frequently Asked Questions

1. Does brewer’s yeast give baby gas?

other’s consumption of potentially gas-causing foods usually does not cause gas in the breastfed infants. You may stop taking brewer’s yeast for a few days to see if it helps reduce gas in your baby. However, the mother’s diet may affect the taste of the breast milk (5). Brewer’s yeast is bitter and may pass on the flavor to the milk.

2. How quickly does brewer’s yeast increase milk supply?

Anecdotal evidence suggests that you may notice a change in breastmilk supply after a day or two of starting brewer’s yeast. However, there is no scientific evidence to prove its efficacy and you may not observe any noticeable change (5).

3. Can brewer’s yeast while breastfeeding help you lose weight?

Brewer’s yeast has not been reported to help in weight loss. On the contrary, some women have reported weight gain as an adverse reaction to brewer’s yeast (6).

Although a galactagogue and a good source of proteins and B vitamins, considering Brewer’s yeast when breastfeeding could be unsafe. The scientific research on the efficacy of brewer’s yeast is limited, and one cannot be sure how it affects milk production. Keeping this factor in mind, it is necessary to consult a doctor before using brewer’s yeast as a nutritional supplement. Also, women with food allergies, depression, or diabetes should avoid taking brewer’s yeast because of the probability of side effects, such as nausea, vomiting, and anaphylactic shock. Therefore, make an informed decision about its intake and stop using it if you notice any emergency issues.

Infographic: Ways To Include Brewer’s Yeast In Your Diet

Brewer’s yeast is considered a galactagogue, but there’s insufficient scientific evidence. However, you may consult your doctor and use it to boost lactation. Go through the infographic below to learn some delicious ways to include Brewer’s yeast in your diet.

brewers yeast recipes to boost lactation [infographic]
Illustration: MomJunction Design Team


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Brewer’s Yeast; URMC Encyclopedia
2. Forinash AB et al.; The use of galactogogues in the breastfeeding mother; Ann Pharmacother. (2012)
3. Brewer’s Yeast – How it works?; Kaiser Foundation Health Plan of Washington
4. Gene Bruno; Nutritional Yeast & Liver; Huntington College of Health Sciences
5. 5 Breastfeeding Diet Myths; Johns Hopkins Medicine
6. Gene Bruno; Brewer’s Yeast; National Library of Medicine
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Rohit Garoo

Rohit Garoo did MBA from Osmania University and holds a certificate in Developmental Psychology from The University of Queensland. The zoologist-botanist turned writer-editor has over 8 years of experience in content writing, content marketing, and copywriting. He has also done an MBA in marketing and human resources and worked in the domains of market research and e-commerce. Rohit writes topics...
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Briana Violand

Briana Violand, International Board Certified Lactation Consultant (IBCLC) and Certified Child Sleep Consultant (CSC), graduated from Tiffin University with a Bachelor’s Degree in Business Administration and is a Certified Child Sleep Consultant (CSC) through the Family Sleep Institute. She has 8 years of breastfeeding, and countless hours of education and training. She enjoys helping people. Her goals are to educate,...
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